When I click to play online I manage to send an invite to my friend. He is able to join the lobby.

But once he is in, we don't know how to continue. I don't see any option for starting or ready or ?

I know not many are playing this game any more but I just found 3 brand new ones for 49 cents each and would really love to hook up with my 2 friends to play. Any help is greatly appreciated. Thank you.